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1-4 of 4
Jonathon H. Yoder
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Journal Articles
Jonathon H. Yoder, John M. Peloquin, Gang Song, Nick J. Tustison, Sung M. Moon, Alexander C. Wright, Edward J. Vresilovic, James C. Gee, Dawn M. Elliott
Journal:
Journal of Biomechanical Engineering
Article Type: Research-Article
J Biomech Eng. November 2014, 136(11): 111008.
Paper No: BIO-14-1099
Published Online: September 17, 2014
Abstract
Study objectives were to develop, validate, and apply a method to measure three-dimensional (3D) internal strains in intact human discs under axial compression. A custom-built loading device applied compression and permitted load-relaxation outside of the magnet while also maintaining compression and hydration during imaging. Strain was measured through registration of 300 μm isotropic resolution images. Excellent registration accuracy was achieved, with 94% and 65% overlap of disc volume and lamellae compared to manual segmentation, and an average Hausdorff, a measure of distance error, of 0.03 and 0.12 mm for disc volume and lamellae boundaries, respectively. Strain maps enabled qualitative visualization and quantitative regional annulus fibrosus (AF) strain analysis. Axial and circumferential strains were highest in the lateral AF and lowest in the anterior and posterior AF. Radial strains were lowest in the lateral AF, but highly variable. Overall, this study provided new methods that will be valuable in the design and evaluation surgical procedures and therapeutic interventions.
Proceedings Papers
Jonathon H. Yoder, Joshua D. Auerbach, Philip M. Maurer, Erik M. Erbe, Dean Entrekin, Richard A. Balderston, Rudolf Bertagnoli, Dawn M. Elliott
Proc. ASME. SBC2007, ASME 2007 Summer Bioengineering Conference, 673-674, June 20–24, 2007
Paper No: SBC2007-176917
Abstract
Endplate subsidence and vertebral body (VB) fracture are potential complications following lumbar total disc replacement (TDR) [1]. Early clinical evidence suggests that these events can be ameliorated in patients with osteopenia and osteoporosis by vertebral augmentation performed at the time of TDR [2]. However, the biomechanical basis to support vertebral augmentation of TDR has not been established. The objective of this study was to quantify the effects of vertebral augmentation with Cortoss on VB mechanics under compression by a TDR implant. We hypothesize that augmentation with Cortoss will improve the mechanical behavior in compression.
Proceedings Papers
John M. Peloquin, Jonathon H. Yoder, Nathan T. Jacobs, Sung M. Moon, Alexander C. Wright, Edward J. Vresilovic, Dawn M. Elliott
Proc. ASME. SBC2012, ASME 2012 Summer Bioengineering Conference, Parts A and B, 1289-1290, June 20–23, 2012
Paper No: SBC2012-80645
Abstract
Degeneration of the intervertebral disc (IVD) is implicated in low back pain, which is a costly and prevalent disease. Since the IVD is a mechanically active organ, it is important to consider its mechanical behavior as one factor in the degenerate pathology. Strain can be measured directly by imaging methods, but the stress distribution within the disc must be calculated. The stress distribution for a particular strain state is dependent on the IVD’s material properties and its geometry. While the material properties of the tissues comprising IVD have been extensively studied, its three-dimensional geometry remains incompletely characterized. Prior whole-disc models have been constructed from single IVDs. While this approach ensures that the geometry has a physiological basis, it is uncertain the degree to which results from a single IVD shape can be generalized to the entire population.
Proceedings Papers
Proc. ASME. SBC2009, ASME 2009 Summer Bioengineering Conference, Parts A and B, 307-308, June 17–21, 2009
Paper No: SBC2009-206833
Abstract
The annulus fibrosus (AF) is a highly organized structure made up of concentric lamellae of fibers embedded in a hydrated extrafibrillar matrix; the collagen fibers are oriented at alternating angles in each lamella. The AF undergoes multidirectional loading through combinations of compression, bending, torsion and shear of the motion segment. The composition and structure of the AF leads to mechanical stress-strain nonlinearity and anisotropy. Previous tissue-based studies of shear have tested the AF tissue under compressive simple shear and torsion, producing shear modulus on the order of 0.06–0.4 MPa [1, 2]. However, structural testing and mathematical models of the IVD have reported the shear modulus to be between 3–20 MPa [3–6]. We hypothesize that when the fibers of the AF are loaded the shear modulus will be on the same order as structural tests and mathematical models of the IVD. The objectives of this study are to measure the shear mechanical properties of the bovine outer AF and compare the regional variances between anterior and posterior AF.
